Haproxy 2.0.6 - nbsrv is not working

Hi Mates,

I have this below config, my requirement is to route the requests if main-backend’s available servers becomes 1 out of 2, so I tried nbsrv, but ended up with some problem there which is not working as expected

frontend myApplication 
  bind :::443 ssl crt <cert/location> 
  log global 
  maxconn 10000
  acl main_is_down nbsrv(main-backend) le 1
  use_backend backup-backend if main_is_down
  default_backend main-backend

backend main-backend 
  option httpchk GET /healthCheck
  server server1 1.2.3.4:8080 maxconn 100 check 
  server server2 1.2.3.5:8080 maxconn 100 check    

backend backup-backend 
   option httpchk GET /healthCheck
   server backup-server1 2.1.3.4:8080 maxconn 100 check
  server backup-server2 2.1.3.5:8080 maxconn 100 check

All the servers in main-backend is down, request is getting failed with 503 since both the servers in main-backend is down

Could you please help in suggesting the changes in this config to make it work so that I can forward the requests to backup-backend ?

Thanks in Advance!

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